﻿//JavaScript Document  
//jQuery(上下)滚动插件

(function ($) {
    //滚动
    $.fn.myScroll = function (options) {
        //默认配置
        var defaults = {
            speed: 40,//滚动速度,值越大速度越慢
            rowHeight: 24//行高,每行的高度
        };



        var opts = $.extend({}, defaults, options), intId = [];

        function marquee(obj, step) {
            obj.find("ul").animate({
                marginTop: '-=1'
            }, 0, function () {
                var s = Math.abs(parseInt($(this).css("margin-top")));
                if (s >= step) {
                    $(this).find("li").slice(0, 1).appendTo($(this));
                    $(this).css("margin-top", 0);
                }
            });
        }


        this.each(function (i) {
            var sh = opts["rowHeight"], speed = opts["speed"], _this = $(this);
            intId[i] = setInterval(function () {
                if (_this.find("ul").height() <= _this.height()) {
                    clearInterval(intId[i]);
                } else {
                    marquee(_this, sh);
                }
            }, speed);

            _this.hover(function () {
                clearInterval(intId[i]);
            }, function () {
                intId[i] = setInterval(function () {
                    if (_this.find("ul").height() <= _this.height()) {
                        clearInterval(intId[i]);
                    } else {
                        marquee(_this, sh);
                    }
                }, speed);
            });
        });
    }
})(jQuery);